A lot of LRT in JMS Queue Sender activity

Hi all,

I am facing wiered issue. In one Service JMS Q Sender is being used to send a message to JMS Q (to CLEH Framework Queue). Sunddenly when Service is running all the jobs get stuck at JMS Queue Sender Activity creating a lot of LRT in such as activity. Service still accepts new transactions but everything gets stuck into JMS Q Sender Activity.  The service comes to normal when the engine is recycled.

Any help if someone faced similar issue earlier?